Pooling and Unitization.

the terms "pooling" and "unitization" are frequently used interchangeably, more properly "pooling" means the bringing together of small tracts sufficient for the granting of a well permit under applicable spacing rules whereas "unitization," or, as it is sometimes described, "unit operation," means the joint operation of all or some part of a producing reservoir.

[2] — Traditional Concepts of Well Spacing.
The rule of capture yielded results during the early days of oil and gas development that were not contemplated or desired by its authors. In response, various producing states enacted oil and gas conservation statutes near the turn of the Twentieth Century to curb excessive drilling and protect correlative rights. 24 A primary feature of many conservation laws was the imposition of spacing requirements, which limited the number of wells that could be drilled within a specified acreage.25 It is against this backdrop that the concept of pooling tracts together for production first emerged.26 In general, spacing requirements govern the location of wells within a given pool or common reservoir. In order to appreciate this relationship, it is important to have a basic understanding of well spacing. Once one grasps the fundamental concepts of well spacing, it can readily be seen how pooling emerged as a natural next step in the evolution of this aspect of oil and gas law. 27 There are two types of spacing rules. First, there are “lineal” rules that prescribe setback distances between a well and other points.28 Typically, spacing rules will establish a minimum distance between any two wells and from each well to the boundaries of the unit or leasehold upon which it sits. In addition, some states impose setback requirements from dwellings, public roads, or other features.29 The other principal type of spacing dictates the standard acreage required for a single well and within which no other well may be located.30 This second type of spacing is often referred to as “density” spacing.31By limiting the number of wells that may be drilled in a given area, lineal and density spacing rules seek to protect correlative rights and prevent waste.32 In accomplishing these objectives, the spacing rules can also create a situation in which a landowner is prevented from being able to produce

such as (1) community leases that embrace multiple.
Most often.37 In modern practice.38 The second type. separately owned tracts or interests to effectuate joint development. 39 This fragmented ownership may be the result of an existing lease to a party other than the proposed operator or unleased owners who fail to negotiate satisfactory terms for voluntary inclusion in the unit. two basic types of pooling exist.41 If granted. the vast majority of producing states provide a statutory process by which. as each owns insufficient acreage to obtain a well permit.35 In theory. voluntary pooling involves private arrangements to allow for joint development of the separately owned oil and gas interests within a spacing unit. upon consent from a requisite proportion of the owners or operators in the area to be pooled.42 The rationale behind statutory pooling is that an owner or operator of a small tract who cannot drill due to spacing requirements should remain entitled to recover the
. It is this situation that pooling is intended to address.33
[3] — The Doctrines of Pooling and Unitization.the oil or gas underlying the land. an owner or operator may petition the authorized state agency laws for a pooling order. The first is voluntary pooling. the order will mandate the inclusion of the interests of non-consenting owners or operators in the pooled area and establish the terms upon which all parties involved will be compensated.40 In these circumstances. referred to as compulsory or statutory pooling. pooling is merely the grouping together of small tracts or interests therein to form a conjoined production unit in compliance with applicable spacing standards.36 As the name implies. arises when applicable spacing requirements necessitate the inclusion of adjacent tracts within the spacing unit that are not commonly owned. the impetus to pool mineral interests is driven by well spacing rules which would otherwise prevent the owners of small tracts from producing the oil and gas underlying their land.34 In simple terms. and (3) contractual pooling agreements. voluntary pooling is accomplished through several mechanisms. (2) lease provisions that authorize a lessee to pool the leased area with nearby tracts.

there is substantial variation in their treatment among the states. unitization exists outside of spacing rules to include a broader scope of joint operations. the term “pooling” most often refers to the integration of smaller tracts and interests therein to obtain a drilling permit in compliance with spacing rules. As a general concern. To deny him that right with no opportunity to realize the economic value of his property amounts to the confiscation of his oil and gas interest without remedy or compensation.43On the other hand.” 45 The main objective of unitization is to maximize production efficiency from a given reservoir and may be sought in the context of drilling permit applications. it is important to clarify the distinction between pooling and unitization. to permit each owner or operator to drill on his small tract results in inefficient land use akin to the degradation surrounding Spindletop. 44 On many levels. a statute may prescribe procedural rules under which an owner or operator may petition the agency for a unitization order. Unitization. As noted above. as well as currently-producing wells and proposed secondary recovery methods. the term “pooling” is used interchangeably to signify the general concept of integrating separately owned interests that includes both mechanisms.47 Like pooling. also commonly labeled “unit operations. pooling and unitization are distinguished when necessary. or. the difference between pooling and unitization is primarily one of procedure and is best understood by considering the relationship of each to spacing requirements.
. while pooling stems directly from the relevant spacing requirements in an area.46 Unitization may also be vital to ensure that correlative rights of the various owners in the pool are protected. A statutory pooling process provides a prudent and equitable solution to this dilemma. 48For the purposes of this article. However. Thus. Although the two concepts are doctrinally similar.oil and gas underlying his land. unitization is governed by state conservation laws that may address the ability of private parties to voluntarily unitize their interests in all or part of a reservoir.” is “the consolidation of mineral or leasehold interests covering all or part of a common source of supply.